NO AUDIO THROUGH HDMI AFTER POWER ON !

Has anyone else encountered loss of audio after powering up . The left and right phono’s ( red & white ) seem fine from the component outputs ( I discovered ) but no HDMI audio until you toggle within audio video settings . It also seems to remember how to produce sound after a stand by period but not a power down .

Has anyone got a fix ?

I have the same problem except only in XBMC.  Audio is good on all other sources.  Been using Boxee to play AVIs but would like XB back.  I have tried every option listed in XB, but no luck